<template>
    <div>
            <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
       <!-- 提示区域 -->
    <el-alert
        title="消息提示的文案"
        type="info"
        center
        show-icon :closable="false">
    </el-alert>

    <!-- 步骤条区域 -->
    <el-steps :active="activeIndex - 0" align-center finish-status="success">
    <el-step title="基本信息"></el-step>
    <el-step title="商品参数"></el-step>
    <el-step title="商品属性"></el-step>
    <el-step title="商品图片"></el-step>
    <el-step title="商品内容"></el-step>
    <el-step title="完成"></el-step>
    </el-steps>

    <!-- tab栏区域 -->
<el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
    <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="deforeTabLeave" @tab-click="tabClicked">
        <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
                <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
                <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
                <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>

            <!-- 级联选择器 -->
            <!--  :options数据源 -->
            <el-form-item label="商品分类" prop="goods_cat">
                <el-cascader
                    expand-trigger="hover"
                    :options="catelist"
                    :props="cateProps"
                    v-model="addForm.goods_cat"
                    @change="handleChange">
                </el-cascader>
            </el-form-item>

        </el-tab-pane>
        <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单得item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                <!-- 复选框组 -->
                <el-checkbox-group v-model="item.attr_vals">
                    <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                </el-checkbox-group>
            </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
        </el-tab-pane>
        <!-- -->
        <el-tab-pane label="商品图片" name="3">
            <!-- action上传地址--on-preview 点击预览时触发--on-remove点击X号触发 --list-type缩略图的呈现方式--->
            <el-upload
                    :action="uploadURL"
                    :on-preview="handlePreview"
                    :on-remove="handleRemove"
                    list-type="picture"
                    :headers="headerObj" :on-success="handleSuccess">
                    <el-button size="small" type="primary">点击上传</el-button>
             </el-upload>
        </el-tab-pane>
        <el-tab-pane label="商品内容" name="4">
            <!-- ???富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
        </el-tab-pane>
    </el-tabs>
</el-form>
</el-card>
<!-- 图片预览 -->
    <el-dialog
    title="图片预览"
    :visible.sync="previewVisible"
    width="50%">
    <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>

    </div>
</template>

<script>
// 
import _ from 'lodash'

export default {
    data() {
        return {
            activeIndex: '0',
            // 添加商品的表单数据对象那个
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat:  [],
                // 
                pics: [],
                // 商品的详情描述
                goods_introduce: '',
                // ???
                attrs: []
            },
            // 表单验证对象
            addFormRules: {
                goods_name: [
                    { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price: [
                    { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_weight: [
                    { required: true, message: '请输入商品的重量', trigger: 'blur' }
                ],
                goods_number: [
                    { required: true, message: '请输入商品数量', trigger: 'blur' }
                ],
                goods_cat: [
                    { required: true, message: '请选择商品分类', trigger: 'blur' }
                ]
            },
            // 商品分类列表
            catelist: [],
            // 
            cateProps: {
                label: 'cat_name', //代表你看到的是哪个属性--分类名称
                value: 'cat_id', // 你选中的是谁的值--
                children: 'children', //指定哪个属性实现父子节点的嵌套
            },
            // 动态参数列表数据
            manyTableData: [],
            // 静态属性列表数据
            onlyTableData: [],
            // 上传图片的url地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            //图片上传组件的headers请求头
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            //
            previewPath: "",
            previewVisible: false
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList() {
           const {data: res} = await this.$http.get(`categories`)
           if (res.meta.status !== 200) {
               return this.$message.error('获取商品分类数据失败')
           }
           this.catelist = res.data
           console.log(this.catelist)
        },
        //级联选择器选中项变化， 会触发这个函数
        handleChange() {
            console.log(this.addForm.goods_cat);
            if (this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = []
            }
        },
        //切换标签之前的钩子
        deforeTabLeave(activeName, oldActiveName) {
            // console.log('即将离开的标签页名称是：' +oldActiveName);
            // console.log('即将进入的标签页名称是：' +activeName);
            if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类')
                return false
            }
        },
        //tab 被选中时触发 
       async tabClicked() {
            // console.log(this.activeIndex);
            // 证明访问的是动态参数面板
            if (this.activeIndex === '1') {
                // console.log('动态参数面板');
               const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'many'}})
               if (res.meta.status !== 200) {
                   return this.$message.error('获取动态参数列表失败')
               }
               console.log(res.data)
               res.data.forEach(item => {
                 item.attr_vals=  item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
               })
               this.manyTableData = res.data;
            } else if (this.activeIndex === '2') {
               const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'only'}})
               if (res.meta.status !== 200) {
                   return this.$message.error('获取静态属性失败')
               }
               console.log(res.data);
            this.onlyTableData = res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file) {
            // console.log(file);
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作 
        handleRemove(file) {
            console.log(file)
            // 1： 获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2:  从pics数组中，找到这个图片的对应的索引值
            const i =  this.addForm.pics.findIndex(x => x.pic === filePath)
            // 3：调用数组的 splice 方法， 把图片信息对象， 从pics数组中溢出
            this.addForm.pics.splice(i, 1)
            console.log(this.addForm)
        },
        //监听图片上传成功的事件
        handleSuccess(response) {
            console.log(response)
            // 1：先拼接得到一个图片信息对象
            const picInfo = {pic: response.data.tmp_path}
            // 2：将图片信息对象， push搭配pics
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        // ???
        add() {
            // console.log(this.addForm)
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                    return this.$message.error('请填写必要的表单项！')
                }
                // 执行添加的业务逻辑
                // lodash  cloneDeep(obj)
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form);
                // 发起请求添加商品
                // 商品的名称，必须是唯一的
                 const {data: res} = await this.$http.post('goods', form)
                if (res.meta.status !== 201) {
                    return this.$message.error('添加商品失败')
                }
                this.$message.success('添加商品成功')
                this.$router.push('/goods')
            })
        }
    },
    computed: {
        cateId() {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null;
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox {
    margin: 0 10px 0 0 !important
}
.previewImg {
    width: 100%
}
// 
.btnAdd {
    margin-top: 15px;
}
</style>